- are wholly or predominantly set in the past, and
- have a significant science fiction or science fantasy element aside from the presence of the Doctor and his TARDIS
Note the importance of the first point. Pseudo-historical stories are dominantly set in the past, relative to the date of publication or broadcast. Many Doctor Who stories have brief instances of time travel in to the past, like Timelash or Silver Nemesis, but these "side trips" do not make the story as a whole a pseudo-historical.
Contrast with Doctor Who historical stories, like The Marian Conspiracy or The Aztecs, which are often of an educational nature, with no science fiction element added in. These are frequently, if probably erroneously, called "pure historicals", and they have their own category.
The following 200 pages are in this category, out of 819 total.